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<a href="#pub-static-attribs">Static Public Attributes</a>  </div>
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<div class="title">stx::btree_default_set_traits&lt; _Key &gt; Struct Template Reference</div>  </div>
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<p>Generates default traits for a B+ tree used as a set.  
 <a href="a00003.html#details">More...</a></p>

<p><code>#include &lt;<a class="el" href="a00026_source.html">btree.h</a>&gt;</code></p>

<p><a href="a00038.html">List of all members.</a></p>
<table class="memberdecls">
<tr><td colspan="2"><h2><a name="pub-static-attribs"></a>
Static Public Attributes</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">static const bool&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="a00003.html#abbb0859c6f7a2b887863011026e28ab1">selfverify</a> = false</td></tr>
<tr><td class="mdescLeft">&#160;</td><td class="mdescRight">If true, the tree will self verify it's invariants after each insert() or erase().  <a href="#abbb0859c6f7a2b887863011026e28ab1"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">static const bool&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="a00003.html#ab06ff26a50cb57614ddaf1096b2871bb">debug</a> = false</td></tr>
<tr><td class="mdescLeft">&#160;</td><td class="mdescRight">If true, the tree will print out debug information and a tree dump during insert() or erase() operation.  <a href="#ab06ff26a50cb57614ddaf1096b2871bb"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">static const int&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="a00003.html#ab0bbc6a8fdfa17275dab38f5a9c80efc">leafslots</a> = <a class="el" href="a00026.html#a5d7b0c98bc4c3029d6d76199caa35b19">BTREE_MAX</a>( 8, 256 / (sizeof(_Key)) )</td></tr>
<tr><td class="mdescLeft">&#160;</td><td class="mdescRight">Number of slots in each leaf of the tree.  <a href="#ab0bbc6a8fdfa17275dab38f5a9c80efc"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">static const int&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="a00003.html#a1a1e1c183cffd510e3fc7e71076bad2b">innerslots</a> = <a class="el" href="a00026.html#a5d7b0c98bc4c3029d6d76199caa35b19">BTREE_MAX</a>( 8, 256 / (sizeof(_Key) + sizeof(void*)) )</td></tr>
<tr><td class="mdescLeft">&#160;</td><td class="mdescRight">Number of slots in each inner node of the tree.  <a href="#a1a1e1c183cffd510e3fc7e71076bad2b"></a><br/></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">static const size_t&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="a00003.html#a5f30b3761385f6d26acbd2ad1f91c95a">binsearch_threshold</a> = 256</td></tr>
<tr><td class="mdescLeft">&#160;</td><td class="mdescRight">As of stx-btree-0.9, the code does linear search in find_lower() and find_upper() instead of binary_search, unless the node size is larger than this threshold.  <a href="#a5f30b3761385f6d26acbd2ad1f91c95a"></a><br/></td></tr>
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<hr/><a name="details" id="details"></a><h2>Detailed Description</h2>
<div class="textblock"><h3>template&lt;typename _Key&gt;<br/>
struct stx::btree_default_set_traits&lt; _Key &gt;</h3>

<p>Generates default traits for a B+ tree used as a set. </p>
<p>It estimates leaf and inner node sizes by assuming a cache line size of 256 bytes. </p>

<p>Definition at line <a class="el" href="a00026_source.html#l00086">86</a> of file <a class="el" href="a00026_source.html">btree.h</a>.</p>
</div><hr/><h2>Member Data Documentation</h2>
<a class="anchor" id="a5f30b3761385f6d26acbd2ad1f91c95a"></a><!-- doxytag: member="stx::btree_default_set_traits::binsearch_threshold" ref="a5f30b3761385f6d26acbd2ad1f91c95a" args="" -->
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template&lt;typename _Key &gt; </div>
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          <td class="memname">const size_t <a class="el" href="a00003.html">stx::btree_default_set_traits</a>&lt; _Key &gt;::<a class="el" href="a00003.html#a5f30b3761385f6d26acbd2ad1f91c95a">binsearch_threshold</a> = 256<code> [static]</code></td>
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<div class="memdoc">

<p>As of stx-btree-0.9, the code does linear search in find_lower() and find_upper() instead of binary_search, unless the node size is larger than this threshold. </p>
<p>See notes at <a href="http://panthema.net/2013/0504-STX-B+Tree-Binary-vs-Linear-Search">http://panthema.net/2013/0504-STX-B+Tree-Binary-vs-Linear-Search</a> </p>

<p>Definition at line <a class="el" href="a00026_source.html#l00110">110</a> of file <a class="el" href="a00026_source.html">btree.h</a>.</p>

</div>
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<a class="anchor" id="ab06ff26a50cb57614ddaf1096b2871bb"></a><!-- doxytag: member="stx::btree_default_set_traits::debug" ref="ab06ff26a50cb57614ddaf1096b2871bb" args="" -->
<div class="memitem">
<div class="memproto">
<div class="memtemplate">
template&lt;typename _Key &gt; </div>
      <table class="memname">
        <tr>
          <td class="memname">const bool <a class="el" href="a00003.html">stx::btree_default_set_traits</a>&lt; _Key &gt;::<a class="el" href="a00003.html#ab06ff26a50cb57614ddaf1096b2871bb">debug</a> = false<code> [static]</code></td>
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<div class="memdoc">

<p>If true, the tree will print out debug information and a tree dump during insert() or erase() operation. </p>
<p>The header must have been compiled with BTREE_DEBUG defined and key_type must be std::ostream printable. </p>

<p>Definition at line <a class="el" href="a00026_source.html#l00096">96</a> of file <a class="el" href="a00026_source.html">btree.h</a>.</p>

</div>
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<a class="anchor" id="a1a1e1c183cffd510e3fc7e71076bad2b"></a><!-- doxytag: member="stx::btree_default_set_traits::innerslots" ref="a1a1e1c183cffd510e3fc7e71076bad2b" args="" -->
<div class="memitem">
<div class="memproto">
<div class="memtemplate">
template&lt;typename _Key &gt; </div>
      <table class="memname">
        <tr>
          <td class="memname">const int <a class="el" href="a00003.html">stx::btree_default_set_traits</a>&lt; _Key &gt;::<a class="el" href="a00003.html#a1a1e1c183cffd510e3fc7e71076bad2b">innerslots</a> = <a class="el" href="a00026.html#a5d7b0c98bc4c3029d6d76199caa35b19">BTREE_MAX</a>( 8, 256 / (sizeof(_Key) + sizeof(void*)) )<code> [static]</code></td>
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<div class="memdoc">

<p>Number of slots in each inner node of the tree. </p>
<p>Estimated so that each node has a size of about 256 bytes. </p>

<p>Definition at line <a class="el" href="a00026_source.html#l00104">104</a> of file <a class="el" href="a00026_source.html">btree.h</a>.</p>

</div>
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<a class="anchor" id="ab0bbc6a8fdfa17275dab38f5a9c80efc"></a><!-- doxytag: member="stx::btree_default_set_traits::leafslots" ref="ab0bbc6a8fdfa17275dab38f5a9c80efc" args="" -->
<div class="memitem">
<div class="memproto">
<div class="memtemplate">
template&lt;typename _Key &gt; </div>
      <table class="memname">
        <tr>
          <td class="memname">const int <a class="el" href="a00003.html">stx::btree_default_set_traits</a>&lt; _Key &gt;::<a class="el" href="a00003.html#ab0bbc6a8fdfa17275dab38f5a9c80efc">leafslots</a> = <a class="el" href="a00026.html#a5d7b0c98bc4c3029d6d76199caa35b19">BTREE_MAX</a>( 8, 256 / (sizeof(_Key)) )<code> [static]</code></td>
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      </table>
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<div class="memdoc">

<p>Number of slots in each leaf of the tree. </p>
<p>Estimated so that each node has a size of about 256 bytes. </p>

<p>Definition at line <a class="el" href="a00026_source.html#l00100">100</a> of file <a class="el" href="a00026_source.html">btree.h</a>.</p>

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<a class="anchor" id="abbb0859c6f7a2b887863011026e28ab1"></a><!-- doxytag: member="stx::btree_default_set_traits::selfverify" ref="abbb0859c6f7a2b887863011026e28ab1" args="" -->
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<div class="memproto">
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template&lt;typename _Key &gt; </div>
      <table class="memname">
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          <td class="memname">const bool <a class="el" href="a00003.html">stx::btree_default_set_traits</a>&lt; _Key &gt;::<a class="el" href="a00003.html#abbb0859c6f7a2b887863011026e28ab1">selfverify</a> = false<code> [static]</code></td>
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<div class="memdoc">

<p>If true, the tree will self verify it's invariants after each insert() or erase(). </p>
<p>The header must have been compiled with BTREE_DEBUG defined. </p>

<p>Definition at line <a class="el" href="a00026_source.html#l00090">90</a> of file <a class="el" href="a00026_source.html">btree.h</a>.</p>

</div>
</div>
<hr/>The documentation for this struct was generated from the following file:<ul>
<li>stx/<a class="el" href="a00026_source.html">btree.h</a></li>
</ul>
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